Commit8bb8b453cb("[ALSA] trident - clean up obsolete synth codes") remove synth functions but leave declarations. And Commite5723b41ab("[ALSA] Remove sequencer instrument layer") left snd_trident_attach_synthesizer(). Signed-off-by: Yue Haibing <yuehaibing@huawei.com> Link: https://patch.msgid.link/20240817093527.1120240-1-yuehaibing@huawei.com Signed-off-by: Takashi Iwai <tiwai@suse.de>